Mark matching Slack alerts when on-chain events arrive
Have Notis acknowledge a matching Slack alert when an Alchemy webhook delivers the related on-chain event.
Trigger
Webhook received
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Action
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
Why this helps
When an alert appears in several places, it is hard to tell whether the team has already noticed the on-chain update.
- Make a matching alert easier to recognize at a glance.
- Reduce duplicate review of the same event.
- Use a consistent reaction as a lightweight acknowledgment.
Setup
Build it in a few focused steps.
- 1Connect Alchemy and Slack once in the Notis portal.
- 2Create an automation in Automations, or tell Notis the outcome you want in plain language.
- 3Ask Notis to find the matching Slack alert using the identifiers in an incoming Alchemy payload and add the reaction you specify.
- 4Pick the Notis webhook trigger and configure Alchemy to send the related events to its webhook URL.
- 5Choose where run reports go and test with one real alert that has a matching Slack message.
Questions about this workflow
What does it need to find the Slack message?
The prompt needs a reliable way to identify the existing message, such as a transaction hash or another shared identifier present in both the alert and Slack message.
Will it create an alert if no matching Slack message exists?
This workflow adds a reaction to an existing message. If no match is found, it cannot react to a message that does not exist.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Alchemy to Slack. A trigger fires from one place; an action lands in another.
Alchemy triggers
Slack actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Set snooze duration
Deprecated: turns on do not disturb mode for the current user, or changes its duration. use `set dnd duration` instead.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Add a custom emoji to a Slack team
Deprecated: adds a custom emoji to a slack workspace given a unique name and an image url. use `add emoji` instead.
Add an emoji alias
Adds an alias for an existing custom emoji in a slack enterprise grid organization.
Add a remote file
Adds a reference to an external file (e.g., google drive, dropbox) to slack for discovery and sharing, requiring a unique `external id` and an `external url` accessible by slack.
Add a star to an item
Stars a channel, file, file comment, or a specific message in slack.
Add call participants
Registers new participants added to a slack call.
Add emoji
Adds a custom emoji to a slack workspace given a unique name and an image url; subject to workspace emoji limits.
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
Connect any two apps with Notis in the middle.
Alchemy and Slack, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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